Category MA P25 Converging logarithmic spirals on the complex plane

Abstract The logarithm of a complex number in the form a+bi can be complicated to

find and is volatile when graphed on the complex plane; however,

continuously taking the logarithm of a complex number and taking the

logarithm of the answer eventually gives a unique spiral that always

converges to the same constant value. I started my project during the

summer of 2009 with the help of Professor Jerold Grossman from Oakland

University. He suggested many books and websites for me to use in order

to research my problem. Since operations with complex numbers get

really complex, I bought a mathematics program called Maple 13(used by

many universities and college students). With the help of the program, I

gathered data as proof of my findings. I created tables where I showed

the patterns of my mathematical operations and used Maple to create plots

that visually showed these numbers. To further my research, I went on to

prove that my function does converge for many, if not all, values in the

form a+bi. My proof includes the use of the Cauchy’s convergence

theorem along with some unique proofs of my own.

Bibliography http://math.fullerton.edu/mathews/c2003/ComplexFunLogarithmMod.html



http://mathworld.wolfram.com/Logarithm.html



http://www.geom.uiuc.edu/~banchoff/script/CFGExp.html
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